Emulated Ringing

Microsoft Lync UCMA does not provide the notification about the transition of an endpoint into alerting state. So, straightforward UCMA approach does not allow notifying T-Client and providing corresponding attached data, when a call is delivered to the agent endpoint.

To address this issue, T-Server emulates EventRinging as soon as an invitation for a new conversation is sent to an agent. Emulation creates a race condition, between alerting phone and EventRinging on the desktop.

To resolve the race condition, the desktop application implements the following logic:

If EventRinging arrives first at the desktop:

Stores value Conversation-ID from the AttributeExtensions of EventRinging.

Waits for a new conversation with Conversation-ID matching the Conversation-ID extension key in EventRinging.